While the age of the home is important with regard to style, design and features, what is far more important is location and condition (remember location, location, location). Any home can be remodeled or updated, but the location cannot be changed.
I have seen many older homes (1970's is not old) that were in perfect condition, classic designs, if you will. I have also seen newer homes that were not maintained and were falling apart.
The only real issue is do you like the styling of the older home or do you prefer the newer styling or recent homes?